Xbox report issue

Question

Why on my account I get banned for telling someone to kts (I don't really want someone to) after they told me to in separate letter and call them a miserable human but when I report his messages about him saying my kind (blacks) shouldn't even be humans and just monkeys and saying I should be hung in separate messages and him saying other racists crap he doesn't get striked that's just fucked up to fucked up